On friday, replacing the oil in the 4.0 with Valvoline Nextgen Maxlife 10w-30 and a purolator pure one oil filter. We'll see how she goes...oil going out has been in there for only a little over a month(Rotella T5)...I've only had the jeep for 4 months, and I think it sat for a long time before I owned it-as the Rotella coming out is ALREADY black as night.

The jeep also may be going up for sale soon as well...unfortunately I need a bit more towing power for the boat, my eyes are on multiple 4.7 HO Overlands! What do you guys think I could fetch for a great condition 2002 Jeep GC Laredo with 116,000 miles and the 4.0?

If your oil is black as night there some wrong with engine i would think, i run 4k on rotella t6 and still has a smidgen of gold color